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Overview of SEP research

Overview of SEP research. Paul Sava. The problem. Modeling operator. Seismic image. Seismic data. Migration. Migration operator. Seismic image. Seismic data. Migration operator: wavefield propagation. Downward continuation Common-azimuth migration Narrow-azimuth migration

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Overview of SEP research

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  1. Overview of SEP research Paul Sava

  2. The problem Modeling operator Seismic image Seismic data

  3. Migration Migration operator Seismic image Seismic data

  4. Migration operator: wavefield propagation Downward continuation Common-azimuth migration Narrow-azimuth migration Reverse time migration • Propagation • Imaging • Amplitudes • Velocity

  5. Downward continuation Biondi, 2003 Common-azimuth Narrow-azimuth

  6. Reverse-time migration Biondi & Shan, 2002 Reverse-time migration Downward-continuation

  7. Migration operator: angle-gathers Data-space Prucha et al Image-space Sava&Fomel, Tisserant&Biondi (S-G) Rickett&Sava (shot profile) Rosales&Rickett (converted waves) Biondi&Shan (reverse-time) • Propagation • Imaging • Amplitudes • Velocity

  8. Angle-domain common image gathers Prucha et. Al (1999), Sava&Fomel (2002) Image space ADCIG Data-space ADCIG

  9. 3-D angle gathers Tisserant & Biondi (2003)

  10. Migration operator: amplitudes Amplitude preserving wavefield extrapolation Sava & Biondi Amplitude corrections of extrapolation operators Vlad et. al Hi resolution imaging condition Valenciano & Biondi • Propagation • Imaging • Amplitudes • Velocity

  11. Amplitude-preserving migration Sava & Biondi (2002) Kinematic migration Amplitude preserving

  12. Migration operator: velocity Traveltime-based Clapp Wavefield-based Sava & Biondi • Propagation • Imaging • Amplitudes • Velocity

  13. Angle-domain traveltime tomography Clapp (2001)

  14. Tomography: geological constraints Clapp (2001) 1 -.4 -.6

  15. Wave-equation MVA g g x x z z Sava & Biondi (2003) Slowness perturbation Image perturbation

  16. Wave-equation MVA Sava & Biondi (2003)

  17. Multiple attenuation Multiple attenuation Data space Image space Multiple imaging Joint imaging

  18. Multiple attenuation: data space Guitton (2003) Hyperbolic Radon Adaptive filtering Pattern recognition Input data 2.6 Time (s) 5.

  19. Multiple attenuation: image space Sava & Guitton (2003) PRT image space HRT data space

  20. Multiple imaging Multiple attenuation Data space Image space Multiple imaging Joint imaging

  21. Multiple imaging: shot-profile migration Guitton (2002) Up-going wavefield Up-going wavefield Down-going wavefield Down-going wavefield Impulse Primaries Primaries Multiples Primaries imaging Multiples imaging

  22. Multiple imaging: S-G migration Shan (2003)

  23. Joint imaging Multiple attenuation Data space Image space Multiple imaging Joint imaging

  24. Joint imaging Brown (2003) S G

  25. Migration Migration operator Seismic image Seismic data

  26. Least-squares imaging Inversion operator Seismic image Seismic data

  27. Least-squares imaging • Normalized migration • Matching filters • Least-squares inverse • Multiple realizations • Illumination compensation • Rickett (2001) • Prucha (2003)

  28. Normalized migration Rickett (2003)

  29. Least-squares imaging Guitton (2003) • Normalized migration • Matching filters • Least-squares inverse • Multiple realizations L* L*L data -1 (L*L) B Find B such that

  30. Imaging with mathching filters Guitton (2003)

  31. Least-squares inverse • Normalized migration • Matching filters • Least-squares inverse • Multiple realizations

  32. Regularization Prucha (2003) ph x z z z-ph preconditioning z-x preconditioning

  33. Regularized inversion Prucha (2003) Least-squares inverse Migration

  34. Multiple realizations • Normalized migration • Matching filters • Least-squares inverse • Multiple realizations

  35. Multiple realizations: interpolation Clapp (2002)

  36. Multiple realizations: velocity Clapp (2002)

  37. http://sepwww.stanford.edu • Reports (all online) • Seplib • Computers: 4 clusters • 3D real data

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